E2277 says 'Lvalue required'. Well the enum variable num is a valid Lvalue. It is OK to assign to it with a simple assigment operator, e.g: num = 2;But one cannot use the 'combined' operators like |= or &=.I even ticked the project option C++ Compiler --> Integer-typed enums, so that it would be treated line an int, but still got the same error.I don't know if XE2 is fully C11 conformant, but I can't see anything in C11 that forbids using this syntax.Any ideas much appreciated.